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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Cash Equivalents [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | $ 1,389 | $ 1,221 | $ 1,307
Marketable Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities, Held-to-maturity | $ 6 | $ 5 | $ 49

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